On 3/10/07, Philip Guenther <[EMAIL PROTECTED]> wrote:
On 3/10/07, Darren Spruell <[EMAIL PROTECTED]> wrote: > On 3/10/07, J Moore <[EMAIL PROTECTED]> wrote: ... > > So - are you saying that these strings will never show up in the headers > > of an email message returned to a legitimate sender? > > No. Headers and message are sent in the SMTP DATA portion. The > communications in the delivery setup are outside of that.They (the text in SMTP responses) won't show up in the headers, but they may show up in the body of DSNs or bounces generated by the client. Yes, that can happen even when the response is a 4xy temporary failure if the client has hit its "report delay" timeout or "give up completely" timeout for delivery attempts. That won't occur under normal circumstances with normal timeouts, but let's imagine that connectivity to your mailserver was disrupted for a day ("backhoe induced fadeout?"); clients may hit their "delay" timeout right after their first chance to connect to you. Unlikely, but possible.
I'm referring to the HELO/EHLO, RCPT TO, and MAIL FROM verbs. Under no circumstances I'm aware of will you see the output of these verbs in a bounce message. Is this not so? DS
